DIELECTRIC SINGULARITIES AND PHASE-TRANSITIONS IN MOLECULAR-CRYSTALS

被引：15

作者：

MUNN, RW ^{[1
]}

LUTY, T ^{[1
]}

机构：

[1] CATHOLIC UNIV NIJMEGEN,INST THEORET CHEM,NIJMEGEN,NETHERLANDS

来源：

CHEMICAL PHYSICS | 1979年 / 38卷 / 03期

关键词：

D O I：

10.1016/0301-0104(79)89014-X

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

In crystals composed of sufficiently polarizable molecules, the low-frequency dielectric screening can be singular. A self-consistent dynamical treatment using vibrationally averaged polarizabilities shows how the singularity can produce Kohn anomalies, soft modes and phase transitions. Dielectric screening by mobile conduction electrons need not to be invoked. It is shown that the singularity is suppressed by a periodic lattice distortion commensurate with the original lattice. © 1979.

引用

页码：413 / 420

页数：8

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